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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #ifndef	_SCTP_ADDR_H
     27 #define	_SCTP_ADDR_H
     28 
     29 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     30 
     31 #include <sys/list.h>
     32 #include <sys/zone.h>
     33 #include <inet/ip.h>
     34 
     35 #ifdef	__cplusplus
     36 extern "C" {
     37 #endif
     38 
     39 /*
     40  * SCTP IPIF structure - only relevant fields from ipif_t retained
     41  *
     42  * There is a global array, sctp_g_ipifs, to store all addresses of
     43  * the system.  Each element of the global array is a list of
     44  * sctp_ipif_t.
     45  *
     46  * This structure is also shared by all SCTP PCBs.  Each SCTP PCB has
     47  * an array of source addresses.  Each element of that array is a list
     48  * of sctp_saddr_ipif_t.  And each sctp_saddr_ipif_t has a pointer
     49  * to a sctp_ipif_t.  The reason for sctp_saddr_ipif_t is that each
     50  * SCTP PCB may do different things to a source address.  This info
     51  * is stored locally in sctp_saddr_ipif_t.
     52  *
     53  */
     54 typedef struct sctp_ipif_s {
     55 	list_node_t		sctp_ipifs;	/* Used by the global list */
     56 	struct sctp_ill_s	*sctp_ipif_ill;
     57 	uint_t			sctp_ipif_mtu;
     58 	uint_t			sctp_ipif_id;
     59 	in6_addr_t		sctp_ipif_saddr;
     60 	int			sctp_ipif_state;
     61 	uint32_t		sctp_ipif_refcnt;
     62 	zoneid_t		sctp_ipif_zoneid;
     63 	krwlock_t		sctp_ipif_lock;
     64 	boolean_t		sctp_ipif_isv6;
     65 	uint64_t		sctp_ipif_flags;
     66 } sctp_ipif_t;
     67 
     68 /* ipif_state */
     69 #define	SCTP_IPIFS_CONDEMNED	-1
     70 #define	SCTP_IPIFS_INVALID	-2
     71 #define	SCTP_IPIFS_DOWN		1
     72 #define	SCTP_IPIFS_UP		2
     73 
     74 /*
     75  * Individual SCTP source address structure.
     76  * saddr_ipifp is the actual pointer to the ipif/address.
     77  * saddr_ipif_dontsrc is used to mark an address as currently unusable. This
     78  * would be the case when we have added/deleted an address using sctp_bindx()
     79  * and are waiting for the ASCONF ACK from the peer to confirm the addition/
     80  * deletion. Additionally, saddr_ipif_delete_pending is used to specifically
     81  * indicate that an address delete operation is in progress.
     82  */
     83 typedef struct sctp_saddrs_ipif_s {
     84 	list_node_t	saddr_ipif;
     85 	sctp_ipif_t 	*saddr_ipifp;
     86 	uint32_t	saddr_ipif_dontsrc : 1,
     87 			saddr_ipif_delete_pending : 1,
     88 			saddr_ipif_unconfirmed : 1,
     89 			pad : 29;
     90 } sctp_saddr_ipif_t;
     91 
     92 #define	SCTP_DONT_SRC(sctp_saddr)	\
     93 	((sctp_saddr)->saddr_ipif_dontsrc ||	\
     94 	(sctp_saddr)->saddr_ipif_unconfirmed)
     95 
     96 
     97 /*
     98  * SCTP ILL structure - only relevant fields from ill_t retained.
     99  * This pretty much reflects the ILL<->IPIF relation that IP maintains.
    100  * At present the only state an ILL can be in is CONDEMNED or not.
    101  * sctp_ill_ipifcnt gives the number of IPIFs for this ILL,
    102  * sctp_ill_index is phyint_ifindex in the actual ILL structure (in IP)
    103  * and sctp_ill_flags is ill_flags from the ILL structure.
    104  *
    105  * The comment below (and for other netstack_t references) refers
    106  * to the fact that we only do netstack_hold in particular cases,
    107  * such as the references from open streams (ill_t and conn_t's
    108  * pointers). Internally within IP we rely on IP's ability to cleanup e.g.
    109  * ire_t's when an ill goes away.
    110  */
    111 typedef struct sctp_ill_s {
    112 	list_node_t	sctp_ills;
    113 	int		sctp_ill_name_length;
    114 	char		*sctp_ill_name;
    115 	int		sctp_ill_state;
    116 	uint32_t	sctp_ill_ipifcnt;
    117 	uint_t		sctp_ill_index;
    118 	uint64_t	sctp_ill_flags;
    119 	boolean_t	sctp_ill_isv6;
    120 	netstack_t	*sctp_ill_netstack; /* Does not have a netstack_hold */
    121 } sctp_ill_t;
    122 
    123 /* ill_state */
    124 #define	SCTP_ILLS_CONDEMNED	-1
    125 
    126 #define	SCTP_ILL_HASH	16
    127 
    128 typedef struct sctp_ill_hash_s {
    129 	list_t	sctp_ill_list;
    130 	int	ill_count;
    131 } sctp_ill_hash_t;
    132 
    133 
    134 #define	SCTP_IPIF_REFHOLD(sctp_ipif) {				\
    135 	atomic_add_32(&(sctp_ipif)->sctp_ipif_refcnt, 1);	\
    136 }
    137 
    138 #define	SCTP_IPIF_REFRELE(sctp_ipif) {					\
    139 	rw_enter(&(sctp_ipif)->sctp_ipif_lock, RW_WRITER);		\
    140 	ASSERT((sctp_ipif)->sctp_ipif_refcnt != 0);			\
    141 	if (--(sctp_ipif)->sctp_ipif_refcnt == 0 && 			\
    142 	    (sctp_ipif)->sctp_ipif_state == SCTP_IPIFS_CONDEMNED) {	\
    143 		rw_exit(&(sctp_ipif)->sctp_ipif_lock);			\
    144 		sctp_ipif_inactive(sctp_ipif);				\
    145 	} else {							\
    146 		rw_exit(&(sctp_ipif)->sctp_ipif_lock);			\
    147 	}								\
    148 }
    149 
    150 /* Address set comparison results. */
    151 #define	SCTP_ADDR_EQUAL		1
    152 #define	SCTP_ADDR_SUBSET	2
    153 #define	SCTP_ADDR_OVERLAP	3
    154 #define	SCTP_ADDR_DISJOINT	4
    155 
    156 extern int		sctp_valid_addr_list(sctp_t *, const void *, uint32_t,
    157 			    uchar_t *, size_t);
    158 extern int		sctp_dup_saddrs(sctp_t *, sctp_t *, int);
    159 extern int		sctp_compare_saddrs(sctp_t *, sctp_t *);
    160 extern sctp_saddr_ipif_t	*sctp_saddr_lookup(sctp_t *, in6_addr_t *,
    161 				    uint_t);
    162 extern in6_addr_t	sctp_get_valid_addr(sctp_t *, boolean_t, boolean_t *);
    163 extern size_t		sctp_saddr_info(sctp_t *, int, uchar_t *, boolean_t);
    164 extern void		sctp_del_saddr_list(sctp_t *, const void *, int,
    165 			    boolean_t);
    166 extern void		sctp_del_saddr(sctp_t *, sctp_saddr_ipif_t *);
    167 extern void		sctp_free_saddrs(sctp_t *);
    168 extern void		sctp_saddr_init(sctp_stack_t *);
    169 extern void		sctp_saddr_fini(sctp_stack_t *);
    170 extern int		sctp_getmyaddrs(void *, void *, int *);
    171 extern int		sctp_saddr_add_addr(sctp_t *, in6_addr_t *, uint_t);
    172 extern void		sctp_check_saddr(sctp_t *, int, boolean_t,
    173 			    in6_addr_t *);
    174 
    175 #ifdef	__cplusplus
    176 }
    177 #endif
    178 
    179 #endif	/* _SCTP_ADDR_H */
    180